The girl

I was playing outside with my friends one day, I looked to my left I saw this girl. She had long black hair and  wore a ripped shirt down to her knees. It started raining very hard, lighting was flashing in every direction. The girl looked up but in the flash of lightning I saw nothing, she was gone. I went back to my home, I couldn't find my parents. I checked almost every room in the house, but when I went into the garage. I saw her she had a knife, my parents where lying dead on the floor.